Re: session synchronization (replication) between two httpd servers configured as load balancers

[Ali Majdzadeh <ali.majdzadeh@xxxxxxxxx>]

Igor,

Hi

Thanks for your reply. Yes, I was talking about the peer option in HAProxy; but I think that option is appropriate in a situation that the two load balancers are configured to use the sticky table as the mechanism to maintain active sessions; is that right? In other words, if the cookie method is used, there is no need to synchronize the sticky table between two load balancers; do you agree?

Now, is the same situation valid for Apache? I mean, if we configure two apache servers using mod_proxy_balancer as load balancers and also configure the back-end web server to set the cookie, in a case when one of the load balancers fails, is the session maintained using the other active balancer?

By the way, suppose that there is only one back-end web server.

Thanks again.

Warm Regards,
Ali Majdzadeh Kohbanani

2013/9/11 Igor Cicimov <icicimov@xxxxxxxxx>

On Wed, Sep 11, 2013 at 2:45 PM, Igor Cicimov <icicimov@xxxxxxxxx> wrote:

I would like to know, if there exists any solution in order to synchronize (replicate) sessions between two httpd servers which are configured as load balancers using mod_proxy_balancer?

Store the session information in a cookie as explained in the mod_proxy_balancer documentation. In that way the client will provide the session info to apache, no matter which one it lands on (assuming both of them are configured identically). This implies usage of sticky sessions. As far as I'm aware this is the way HAProxy does it as well. Can you please elaborate on which HAProxy (different) functionality you are talking about in regards of sticky table synchronization?

Ah, you are talking about peers option in HAP. I'm afraid there isn't option like that in apache.